3rd Grade Ch. 2 Lesson 4 How are animals from the past like today's animals

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3rd Grade Ch. 2 Lesson 4 How are animals from the past like today's animals

  1. 1. Ch. 2 Lesson 4 How are animals from the past like today’s animals?
  2. 2. fossils <ul><li>signs of past life </li></ul><ul><li>made from hard parts of animals </li></ul><ul><li>tell how Earth has changed over time </li></ul>
  3. 4. 1. fossil mold <ul><li>space in the shape of an animal in rock </li></ul>
  4. 5. 2. cast <ul><li>shape of original fossil </li></ul><ul><li>fossil mold that has been filled with rock materials over time </li></ul>
  5. 7. 3. amber <ul><li>hardened tree sap that traps animals </li></ul>
  6. 9. 4. fossils in tar pits <ul><li>Animals fell into tar pits </li></ul><ul><li>Soft parts of animals broke down </li></ul><ul><li>Left actual bones behind </li></ul>
  7. 10. Saber-toothed tiger Unlike the fossil remains of most dinosaur bones, the bones of this fossil saber-toothed tiger are actual bone.
  8. 12. extinct <ul><li>no longer living </li></ul>
  9. 14. Badlands in South Dakota <ul><li>Before </li></ul><ul><li>hot, wet climate </li></ul>After desert
  10. 15. Reptiles resemble dinosaurs
  11. 16. What is hardened tree sap that trapped animals? tar amber cast fossil mold
  12. 17. The Badlands in South Dakota have always been a desert. TRUE FALSE
  13. 18. What kind of fossil is this? fossil mold cast amber tar pit

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